Sumitomo SMD Multi-Drill features detachable and regrindable replacement drill heads
1 min read
Sumitomo Electric Hardmetal says its breakthrough detachable replacement head drilling technology allows up to five drill sizes to be accommodated by one drill body. Drill heads can also be selected to suit the machine type/power available and the material being processed. The company also says that the Sumitomo SMD Multi-Drill is able to achieve a level of hole tolerance normally only met using the reaming process with the added bonus of maintaining improved hole consistency and in-cut life.
The large range of diameters available for the Sumitomo SMD Multi-Drill – between 12 and 42.5 mm – can be specified in short (3XD), long (5XD) or as a deep hole (8XD) series with effective drilling depths up to 244 mm. A balanced design reduces tool vibration and noise generated under cut.
The two drill head variants have ultra-hard and smooth PVD coating for improved peeling and chipping resistance. The SMDT-MTL ACX70 is designed for general purpose drilling applications. The SMDT-MEL ACX80, suitable for stainless steel or more difficult cutting conditions, provides higher performance on lower powered machine spindles. This is achieved due to some 25% lower cutting force (thrust) being required.
The replaceable drilling head is located on precision ground radial serrations that are fixed to form a rigid and positive clamping platform. The specially treated and surface toughened SMD nickel plated steel body is able to resist wear and oxidation.
The two styles of cutting head SMDT-MEL and MTL are secured with two screws and through the tool coolant supply channels are designed to optimise coolant flow, pressure and direction while maximising heat dissipation. Both head types can be reground.
The SMDT-MTL drill head type has a standard edge preparation and is coated with ACX70 for general carbon steel applications with cutting speeds between 80 and 130 m/min and feedrates of 0.15 to 0.35 mm/rev. Hardened steel (HRC45) can be drilled between 50 and 90 m/min with feedrates of 0.1 to 0.25 mm/rev. Nodular cast iron components can be processed at speeds of 70 to 110 m/min and feedrates between 0.15 to 0.4 mm/rev.
The SMDT-MEL drill head has a light edge preparation and is coated with Sumitomo's latest ACX80 suitable for soft steel where cutting speeds between 80 and 130 m/min and feedrates between 0.15 and 0.4 mm/rev can be maintained. Stainless steel and super alloys can be drilled between 50 and 90 m/min with feedrates between 0.1 to 0.25 mm/rev and grey cast iron 50 to 100 m/min with 0.2 to 0.45 mm/rev feedrates.
